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Series Mark II Molded Plastic Air Velocity Meter
Low in Cost – Direct Reading Scales Offer 3% Accuracy – For Portable or Stationary Applications
Construction is simple with virtually indestructible molded white styrene-acrylonitrile housing, indicating tube and fluid wells, molded ABS knobs and zero adjust plunger, shock mounted glass level vial and leak proof "O" ring seals. Scales are lithograph printed on aluminum and epoxy coated.
For stationary applications, the Mark II air velocity meters can be easily mounted on any vertical surface with the two screws provided. A built in spirit level simplifies leveling.
Just fill the reservoir, adjust fluid level to zero, connect the Pitot tube, and it is ready for operation. For portable applications, the Model A-612 portable stand is available for Models 27 and 28.
A molded plastic swing-out stand and leveling screw for user installation are provided with the Model 40-1-AV which also features rapid shutoff tubing connectors and built-in over pressure traps.
Additional standard accessories include plastic connection tubing, mounting screws, 3/4 oz. bottle of indicating fluid and instructions. Metric ranges are also available.
OEM Specials - All models of the Dwyer® Mark II molded plastic air velocity meters can be supplied with your logo or special scale in OEM quantities. Consult factory for details.
Product Applications
- Measure air velocity in ducts
Models & Ordering
Features
- Thick white styrene-acrylonitrile housing is virtually indestructible
- Moderate overpressures are accommodated by an overflow tank (Model 25) or float operated overflow traps (Model 40)
- Able to be mounted on any vertical surface
Accessories
| Model Number | Description | Usually Ships* | Price | Order | |
|---|---|---|---|---|---|
 |
A-612 | Portable stand. | Next Day | $47.00 | Order |
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A-101 | 1 oz dispenser bottle of red gage fluid, .826 sp. gr. | Next Day | $10.25 | Order |
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A-102 | 4 oz bottle of red gage fluid, .826 sp. gr. | Next Day | $20.00 | Order |
 |
A-103 | 1 pt bottle of red gage fluid, .826 sp. gr. | Next Day | $44.50 | Order |
 |
A-104 | 1 qt bottle of red gage fluid, .826 sp. gr. | Next Day | $83.50 | Order |
 |
A-110 | 1 oz dispenser bottle of blue gage fluid, 1.910 sp. gr. | Next Day | $190.00 | Order |
 |
A-339 | Adapter, brass, 1/8" NPT to 3/16" rubber and 1/8" ID plastic tubing. | Next Day | $5.10 | Order |
| 420706-00 | Red pointer indicator. | 1-2 Weeks | $1.90 | Order | |
| 420706-01 | Green pointer indicator. | 1-2 Weeks | $1.90 | Order |
Product Literature
Manuals
Catalog Pages
SDS
Approvals
Drawings
Questions
- Question
- Is routine maintenance required for a Dwyer red gage fluid type manometer?
- Answer
- Yes. The zero point should be checked periodically as well as the fluid level. After a year of service, particularly with dirty air, the fluid should be replaced to assure that specific gravity changes are not affecting the accuracy of the reading.
- Question
- What is the advantage of using a manometer rather than a Magnehelic® gage?
- Answer
- Dwyer Instruments manufactures many different types and styles of manometers with various accuracies and prices for different applications as well as the Magnehelic® gage. For example, some of the many manometers we manufacture are Hook Gage Manometers with ±0.001 inches water column accuracy; Microtector® Portable Electronic Point Gage to ±0.00025 inches water column accuracy; Handheld Digital Manometers with ±0.5 inches water column accuracy; very inexpensive Mark II Molded Plastic Air Filter Gages at ±3% inches water column accuracy. The key point is that we offer many manometers and the selection depends on your specification, application, convenience needs and pocketbook. Some of the key factors to consider that affect manometer performance and usage are: Characteristics of Indicating Fluid, Readability and Leveling. You should read "Measurement of Pressure with the Manometer" in our catalog to fully understand the importance of these factors and their effect on your reading with the manometer instrument. For many applications people prefer to use our Magnehelic® (dial style) gage with ±2% inches of water column accuracy because of convenience, accuracy, etc., plus when compared to a manometer, it eliminates indicating fluid, need for leveling, and some prefer the readability. If you consider manometers and Magnehelic® gages to measure low air or gas pressures positive, negative, or differential, you have a wide selection to choose from and your application needs can be met with our very broad product line at a great value.
- Question
- Is there a manometer that is compatible with chlorine gas and sodium hydroxide (bleach)?
- Answer
- Unfortunately, we do not have any manometers available that can handle chlorine gas or sodium hydroxide (bleach).
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